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(No Model.) 3Sheets--Sheet 1. G. K. GARVIN & C. E. HADLEY.

\ TAPPING MAGHINE. No. 342,866.

Patented June 1, 1886.

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G. K. GARVIN & C. E. HADLEY.

TAPPING MAGHINE.

No. 342,866. Patented June 1, 1886.

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(No Model.) 3 'Sheets-Sheet 3. G. K. GARVIN 8v 0. E. HADLEY.

TAPPING MACHINE.

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L 0 a w i1 I I UNITED STATES PATENT EErcE.

GEORGE K. GARVIN AND CHARLES E. HADLEY, OF NEV YORK, N.'Y., ASSIGNORS TOE. E. GARVIN & 00., OF SAME PLACE.

TAPPlNG-MACHINE.

SPECIFICATIONforming part of Letters Patent No. 342,866, dated June 1,1886. Application filed October 3, 1885. Serial No. 178,882. (No model.)

To to whom it may concern:

Be it known that we, GEORGE K. GARVIN and CHARLES E. HADLEY, citizens ofthe United States, residing at New York, in the county and State of NewYork, have invented certain new and useful Improvements inTapping-lvlachines,full y described and represented in the followingspecification, and the accompanying drawings, forming a part of thesame.

The object of this invention is to furnish a more effective constructionfor reversing the rotations of the spindle, for running the same upwardat an increased speed, and for shifting the driving-belt by means of atreadle. These improvements will be understood by reference to theannexed drawings, in which Figure 1 is a side elevation of atappingmachine provided with my imprwements. Fig. 2 is aplan of the headof the machine. Fig. 3 is a plan of the bed-plate with the beltshiftingdevices. Fig. 4 is a vertical section of the head, the view alsoincluding a triplever for automatically reversing the clutch mechanism;and Fig. 5 is an external view of the tap-spindle, and of the sleevesand other clutching apparatus directly attached to the spindle. Fig. 6is an enlarged view of thetop ofthe spindle, with the tripping-cone,Fig. 7 being a transverse section of the same at one side of the latchon linez in Fig. 6. Fig. 8 is an end view of the upper clutch-sleeve andreversing rod and key, with the spindle 0 shown in section. Fig. 9 is asection of the clutch devices on line g 3/ in Fig. l, looking downward,the spindle being omitted to introduce an arrow, a, to show thedirection of rotation. Fig. 10 is a plan, and Fig. 11 a side elevation,of the sloping seats, Fig. 11 being projected from Fig. 10, an end viewof the key 6 being shown in dotted lines with its beveled face incontact with the sloping surface s.

A represents the column of the machine,

uponwhich is mounted a table, 13, adapted to support the variousfixtures to betapped.

G is the spindle of the machine, and D a reversing-rod inserted withinits bore and furnished with a transverse key, 6, to operate with theclutching devices.

6 is a slot formed in the spindle, through which the opposite ends ofthe key project, to

engage with seats and dogs which are revolved in opposite directions bysleeves surrounding the spindle. These sleeves are fitted,respectiv'ely, to the lower spindle-bearing, G, and its upper bearing,H, the sleeves being revolved in opposite directions by gearingconnected with a bevel-wheel, I, operated by a conepulley, J, in theusual manner. The seats 8 are fitted inside the lower sleeve, E, towhich is attached a bevel-gear. E, meshing directly with the gear I. Thedogs r,for reversing the rotations of the spindle, are attached to thelower end of the upper sleeve, F, upon which is formed a spur-pinion, F.A pair of spurwheels, L L, are fitted to turn together upon a stud, M,adjacent to the sleeve F, the wheel L meshing with the pinion F. Belowsaid pinion a bevel-gear, K, is fitted to turn loosely upon the sleeveF, with a spur-wheel, K, which meshes with the wheel L, and the wheels LL are so proportioned that one rotation of the bevel-wheel K willproduce two or more rotations of the sleeve F, to operate the tap morerapidly during its reverse movement. The sleeves E and F are rotated inopposite directions by the action of their respective gearings, and thedogs 1' and seats 8 operate upon the projecting ends of the key 6 toturn the spindle in the same direction as the sleeve with which the keyis engaged. The movement of the reversing-rod and holder is sufficientto shift the key from the dogs r to the seats 8, and the rod is actuatedby a holder, N, swiveled to its upper end and carried by a rod, N, whichis fitted to bearings N upon the head of the machine at A, and a handle,N, and link at are pivoted to the rod N to shift the rod by hand. It maythus be moved to engage the key 0 with either the dogs 0' or seats 8 atpleasure; but is pressed normally upwardv to make the key engage withthe dogs 1' by a weight, 0, acting through a lever, 12, upon a collar,a, on'the rod N. A latch, (l, is pivoted upon the bearing N", andprovided with a hook, d, to engage the holder and retain thekey incontact with the seats .9. Such a clutch-key, operated by sleevesrevolving in opposite directions, is not new; but our improvementconsists in the particular construction of the seats 8, which we haveshown upon a larger scale in Figs. 9, 10, and 11, to illustrate theirconstruction more fully.

The object of our improvement is to facilitate the shifting of the keyfrom the seats to the dogs, so as to secure an immediate re versal ofthe rotary movement when the tap has penetrated the desired amount, suchreversal being commonly effected by a cone, f, applied to the upper endof the spindle, and operating to trip the latch d by contacttherewith.

A tap. O, is shown affixed to the nozzle of the spindle G in Fig. 1, andthe operator, by pressure downward upon the handle N, applies the tap tothe object which requires tapping when secured upon the table B, and1naintainssuch pressure until the tapis engaged in the hole which is tobe threaded. The continned rotation of the tap then serves to draw thespindle downward,and thus move the cone j toward the latch d. The coneis adjustable upon the spindle to trip the latch when the tap haspenetrated the threaded hole a suflicient distance. The latch is shownformed with a projection, t, to engage the cone, the sloping face ofwhich pushes such projection sidewise and detaches the hook d from theholder, which latter is shown in Fig. 2 provided with a mortise toreceive the top of the latch. Heretofore, when the cone has thus trippedthe latch a heavy weight has been required to withdraw the key from theseats 8, because of the friction resulting from the heavy strain uponthem, and the parallelism of their sides with the movement of the key.

Our improvement consists in sloping the faces of the seats backward, asshown at s in Fig. 11, and beveling the ends of the key in contacttherewith, as is shown upon the key in Fig. 4. thereby inducing animmediate lougitudiual movement of the key and rod N as soon as thelatchis tripped.

The seats, to secure durability, are separately formed of steel, assegments ofa bush inserted within a recess, 1, in the sleeve E, and areformed with tongues s", fitted to corresponding grooves in the sleeve,as shown in the section of the sleeve in Fig. 9. Screws 8 are insertedthrough the outside of the sleeve into the tongues to hold the seats inplace. -An arrow, a, in said figure shows the direction of thesleevesrotation, and indicates clearly how the sloping faces upon theseats tend to force the key upward when relieved from the restraint ofthe latch d, and the upward movement is thus promptly effected with theassistance of a very light weight upon the lever 1). Such construction,therefore, not only dispenses with the greater part of the weightheretofore employed to reverse the rod 1), but secures much greateraccuracy and certainty in the reversing movement of the clutchingdevices.

It is obvious that the angle or slope s, Fig. 11, may be varied, so asto effect the reversing movement at any required rate; but as thedriving of the tap is effected through these sloping surfaces, it isobvious that their angle should not greatly exceed that which is coneftothe desired point.

required to overcome the friction of their contact with the key, thedriving of the spindle being thus effected without any great upwardstrain upon the latch d, while the upward movement of the key is greatlyhastened when the latch is unlocked.

To adjust the point at which the eonef engages the latch, the cone iscommonly fitted upon a screw-thread, 9, upon the upper end of thespindle, and in such case has required a lock-nut to hold it in itsadjusted position. To obviate the use of such lock-nut, and to hold thecone detachably upon the sleeve, we have invented a spring-catch, n,fitted to a continuous groove, 1;, formed in the screw-thread g, thelatch being pivoted at n upon the cone, and provided with a spring, 0,to hold it normally in the groove. The catch is shown fitted in a slotin the side of the cone, and. projects beyond the pivot to receive thepressure of the spring 'and to form a thumb-piece, a", by which it maybe withdrawn from the groove, and when thus withdrawn the cone may beheld stationary by the hand of the operator, while the spindle isrotated through the agency of its driving-pulley .T to adjust the \Vhenthus adjusted, the catch is allowed to engage with the groove 2), andserves to hold the cone securely in such position until it requiresreadjust ment.

In practice we form two grooves, 11, at opposite sides of the spindle,to secure a more ininute adjustment of the cone upon the thread g. Thecounter-shaft of the machine, carrying the cone-pullcy J and fast andloose pulleys m on,

is shown mounted upon the bed-plate P by means of a standard, Q, thelatter being constructed at its upper end with guides t, to receive aslide, j, to which are fitted shifters k, to guide the fast and loosepulleys n m. The slide is provided between the bearings t with an arm,a, to which is jointed the upper endv of a beltcrank, e, and a treadle,h, is pivoted upon the bed-plate h and jointed to the bellcrank at 71?,so that the depression of the treadle by the operators foot serves tothrow the d riving-belt (not shown in the drawings) upon the pulley m.A. spring, t, is affixed to one of the bearings and to a dog, 1), uponthe slide, and operates'to hold the belt-guides over the loose pulley;and a pawl is pivoted to the bed adjacent to the foot-plate of thetreadle to hold the same downward when depressed by the operator, and tothus retain the beltguides over the fast pulley in opposition to thespring I. The pawl is provided with a spring, Z, to keep it normallyhooked upon the treadle, and with a tail-piece, Z",which may bedepressed at any time when the treadle is Locked down to release thetreadle and permit the spring t to shift the belt-guides and beltgradually over the loosepulleym. Bythiseonstruction thespring t operatesto shift the belt without attention from the operator after the pawl Zisdetached, and the operator is also able, with equal facility, to throwthe belt upon the fast pulley IIO by merely depressing the treadle 71The stopping and starting of the machine are therefore effectedexclusively by the foot of the operator, leaving his hands entirely freeto manipulate the working parts at the head of the machine, and toremove the fixtures from the table as they are tapped.

Having thus described the nature and objects of our invention, what weclaim is 1. In a tapping machine, the clutchingmechanism consisting in aspindle and two sleeves rotated in opposite directions around the same,a key inserted transversely in the spindle and having beveled endsprojected therefrom and movable longitudinally with a centralshifting-rod, projections upon one of the sleeves to rotate the spindlein a reverse direction, and seats 8, affixed within the other sleevearound the spindle and formed with faces sloped toward the said dogs,and adapted both to rotate the spindle by contact with the key and tomove the shifting-rod longitudinally by pressure upon the beveled facesof the key, all combined substantially as herein shown and described.

2. Ina tappingmachine having a spindle and two sleeves rotated inopposite directions around the same, the combination, with a movable keyfitted transversely in the spindle, of seats 3, secured within one ofthe rotating sleeves by tongues s and screws 3 the seats being formedwith inclined faces 8 sloped backward from the direction of theirrotation, substantially as and for the purpose set forth.

3. In a tapping-machine, the combination, with the spindle O andthesurrounding sleeves E and F, rotated in opposite directions, of thebevel-gear I, the beve1-gear E, affixed to the sleeve E, the pinion F,affixed to the sleeve F and rotated in a direction opposite to the wheelE, the spur-wheels L L, mounted to turn to gether upon the stud N, thebevel-wheel K, fitted loosely upon the sleeve F and rotated by the wheelI, and the spur-wheel K, affixed to the wheel K, for driving the wheelL, the

whole arranged and operated substantially as and for the purpose setforth.

4. A tapping-machine constructed with a column, A, mounted upon abed-plate, P, and provided with a table, B, and operating and reversingmechanism, substantially as described, and the bed-plate jointly with acounter-shaft having fast and loose pulleys, a movble belt'shiftersustained adjacent to the pulleys, a treadle pivoted upon the bed-plateand connected with the belt-shifter, and a pawl arranged and operated tohold the treadle when depressed, the stopping and starting of thetapping mechanism being thus allowed to be effected by the foot of theoperator, leaving his hands at liberty to manipulate the objects appliedto the tableB, and to operate the shifting-handle N substantially asherein set forth.

5. lhe combination, in a tapping-machine, 65 of a tapspindle having athreaded portion provided with a longitudinal groove, a reversing clutchmechanism for actuating the spindle, a cone or dog fitted to thescrew-thread to actuate the clutch-reversing devices, and a catchpivoted on the cone or dog and. locking into the said groove, as and forthe purpose set forth.

6. In a tapping-machine, the combination, with the spindle 0, providedwith screwthread and longitudinal groove, as described, of the cone f,fitted to such thread, the catch n, pivoted on the cone and fitted tosaid groove, and the spring 0 and tail-piece n, for operating the catch,substantially as and for thepurpose set forth.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

GEO; K. GARVIN. CHARLES E. HADLEY.

